Proto-Germanic *skiwją

→ English sky (derived)

→ Old English sceo (mention)

→ Danish sky (inherited)

→ Middle English sky (derived)

→ Middle English skew (derived)

→ Faroese skýggj (derived)

→ Westrobothnian sjy (inherited)

→ Old Swedish sky (inherited)

→ Icelandic ský (inherited)

→ Norwegian Bokmål sky (derived)

→ Old Norse ský (inherited)

→ Swedish sky (inherited)